JP2004008211A - Filter for cigarette and cigarette with the filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent health hazard of a smoker and lightening and uniforming smoking taste of a tobacco by reducing tar and nicotine contained in the smoke of the cigarette. <P>SOLUTION: The filter is obtained by bonding two disks each of which has a dent part and a vent hole on the bottom of the part on one side, on the both sides of a ring setting each dent part facing outside, and then integrates by nipping the laminated disk between fiber rods and then rolling a paper on the outside. The smoke of the tobacco is condensed in the laminated disks and deposits tar on every stroke of smoking by connecting the filter on the cigarette body and accumulates the tar in the disk. The taste of the tobacco changes into uniform and light taste without hot flavor caused by tar because the tar contains tar and nicotine. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter for removing harmful substances such as tar contained in cigarette smoke and a cigarette equipped with the filter.
[0002]
[Prior art]
Health hazards caused by the ingestion of harmful substances contained in cigarette smoke into the body have become a major social problem today. Tobacco is a favorite for relaxing mood, and it is nicotine that does this. However, high intakes are harmful to the human body. Although many harmful substances contained in cigarette smoke have been found, tar is particularly the cause of health damage caused by cigarette smoke, and studies have been conducted on the carcinogenicity and promotion of cancer development of tar. We believe that the tar content of tobacco smoke should be thoroughly removed.
As a method for removing harmful substances in tobacco smoke, one of two fiber rods connected to the tobacco body, in which granular activated carbon is mixed on the upstream side, or a layer of activated carbon is sandwiched between the two fiber rods One is used as a filter for cigarettes.
However, it has been found that this filter cannot sufficiently remove harmful substances such as tar.
Various ideas have been proposed as filters for removing nicotine and tar to date, but many of them have a suspicious effect or are expensive to manufacture. As a method of sandwiching a disk between fiber rods as in the present invention, there are the following proposals.
(I) A filter in which a disk made of a fine fiber layer is sandwiched between conventional fiber rods with a slight gap. (For example, US Pat. No. 3,882,877)
(Ii) A filter in which a disk of a fine fiber layer having a hole at the center is sandwiched between coarse fiber rods. (For example, Japanese Patent Publication No. 2-200174)
In recent years, cigarettes with reduced amounts of tar and nicotine have been favored in order to improve health awareness. Therefore, on the outer wrapping paper connecting the cigarette body and the fiber rod, a large number of micropores are provided on the circumference in one to three rows, through which air is introduced into the fiber rod to dilute the smoke, and tar and nicotine that enter the body. Filters that reduce the amount of water are becoming mainstream. (For example, JP-A-11-69965)
[0003]
[Problems to be solved by the invention]
The filters of the above proposals (i) and (ii) are effective in the early stage of smoking, but as the number of smoking clothes increases, the amount of tar adsorbed on the disc of the fine fiber layer increases, and the Filtration efficiency decreases rapidly with a decrease in ventilation due to clogging.
Tobacco smoke is said to be a state in which liquid particles are dispersed in a gas. Since the tar itself is a liquid, if the tar is adsorbed to the fine fiber layer to reduce the tar content, a decrease in ventilation due to clogging of the fiber layer is inevitable. Therefore, if the density of the fiber layer is reduced, it is possible to prevent a decrease in ventilation due to clogging. However, as the number of smoking clothes increases, the filtration efficiency is significantly reduced, and the amount of tar in the smoke increases. As a result, the taste of the tobacco gradually becomes spicy. As a result, only a small amount of the tar contained in tobacco smoke is adsorbed by the fiber layer, and most of the tar enters the human body. Therefore, it can be said that only the adsorption by the fiber layer is less effective in removing tar.
In addition, a method to reduce the amount of harmful substances inhaled into the body by introducing outside air into the fiber rod through the micropores provided in the wrapping paper outside the filter and reduce the amount of harmful substances inhaled into the body, the cigarette will respond if the amount of outside air introduced is large There is a problem that not only disappears, but also the taste is impaired.
[0004]
An object of the present invention is to remove tar and nicotine, which are considered to be the cause of health damage in cigarette smoking, while removing a substantially constant amount for each dose, and maintaining a uniform taste to the end without impairing the taste of tobacco. It is to provide.
[0005]
[Means for Solving the Problems]
As a method of removing the tar content in tobacco smoke, a method of connecting a filter composed of granular activated carbon or a fiber layer to the tobacco body and adsorbing the tar content therein has been used for many years. However, if the density of the fiber layer is increased in order to increase the filtration efficiency, a decrease in ventilation occurs due to clogging with tar, and it becomes impossible to obtain a satisfactory feeling of smoking. That is, in a fiber filter used for a cigarette, there is a conflicting relationship between the amount of tar removal and the airflow resistance, and it is difficult to increase the amount of tar removal without increasing the airflow resistance.
Therefore, a new means of condensation has been added to the conventional adsorption technology to improve tar removal while preventing a decrease in aeration and without changing the taste of tobacco.
Condensation is defined as a phenomenon in which a part of the saturated vapor is liquefied when the temperature of the saturated vapor is lowered or compressed.
[0006]
Next, the characteristics of the laminated disc that separates the tar by condensing the cigarette smoke will be described.
A dent is formed on one side and two discs with one to four vent holes at the bottom of the dent are placed on both sides of a ring (a disc with a hole in the center) with each dent facing outward. Glue to. As tobacco smoke passes through the stacked discs, it is accelerated in the vents of the upstream disc and travels straight through the holes in the ring, impinging on the inside of the downstream disc and is compressed. As a result, part of the smoke is liquefied to produce brown tar, and the tobacco smoke, which has separated most of the harmful substances, passes through the ventilation holes of the downstream disk and goes out. The tarnish accumulates inside the stacked disks in increasing amounts for each number of tobacco clothes. The tar contains harmful tars and nicotine.
Here, the tar is the particle phase of tobacco smoke. In the literature, the constituents of tobacco smoke usually consist of a gas phase and a particulate phase, the gas phase being almost identical to the constituents of the atmosphere, the particulate phase comprising about 8% of the smoke and tar (about 6. 7%), nicotine (about 0.5%), and water (about 0.8%). (Ichiro Takahashi, Dr. Tobacco's book on Earth, P9)
[0007]
In this laminated disk, due to the arrangement of the ventilation holes on the upstream and downstream disks, the tan generated on the downstream disk may be deposited near the ventilation holes. As the number of tobacco garments increases, the amount of tar increases and, for cigarettes with a high tar content, it flows into the vents. Since the tobacco is continuously smoked, the tar that flows into the hole is sucked out together with the smoke to the back side of the hole, where it is deposited and the airflow resistance is somewhat increased. Also, when disks of the same specification are stacked, the ventilation holes of both disks may overlap in the direction of smoke flow, thereby reducing the effect of condensing smoke.
[0008]
Next, the characteristics of two typical types of the laminated disk filter will be described.
Filters with laminated disks of the same specifications are the lowest in terms of cost. When this disc is bonded to both sides of the ring, the hole of the downstream disc is located in the middle of the vent of the upstream disc so that the vents of both discs do not overlap when viewed on a plane. The phase of the disk. However, when the number of vents of the disk is 3 to 4, even if the phase of the disk is changed, the vents of the adjacent disks are too close on a plane. For this reason, when the accumulation of the tarnish increases, the tarnish flows into the ventilation holes of the downstream disk, and the ventilation decreases. Therefore, it is appropriate that one or two air holes are provided in a laminated disk made of disks having the same specifications.
If the disc has only one vent hole, the hole should be made not on the center of the disc but on the outside of the recess, and the phases of the upstream and downstream discs should be changed by 180 °, but this type of stacking is preferable. Discs have high ventilation resistance and are not practical. Therefore, two air holes are best for laminating disks of the same specification. The holes are provided symmetrically with respect to the center of the disk and near the recessed wall, and the hole phases are shifted by about 90 ° in order to separate the positions of the ventilation holes as viewed on the plane of both disks. In this way, it is possible to prevent the dust generated on the downstream disk from accumulating in the vicinity of the hole and causing a decrease in ventilation. Further, when this laminated disk is connected to and integrated with a fiber rod as described later, there is also an advantage that the work becomes easy because the laminated disk has no directionality.
[0009]
Next, a laminated disk formed by bonding two disks having different diameters, numbers, and arrangements of the ventilation holes to both sides of the ring will be described.
The upstream disk has one hole at the center or two holes near the center, and the downstream disk has two to four holes near the outside of the recess, and the holes overlap on a plane. prevent. In this way, it is possible to prevent the accumulation of the tar on the downstream disk in a position near the ventilation hole. The number of ventilation holes provided in the upstream disk is appropriately one or two. When the number of ventilation holes is three or more, the suction force per one hole is reduced, and the amount of tar generated by condensation is reduced. That is, it is necessary to apply as strong a suction force as possible to the hole of the upstream disk, and the suction force of the upstream disk must not be reduced by the ventilation hole of the downstream disk. Therefore, the number of air holes in the downstream disk is two or more, and in some cases, the diameter of the air holes is made larger than that of the upstream disk.
When the number of ventilation holes in the upstream disk is one, two or more ventilation holes in the downstream disk are provided near the recessed wall. In this case, although the maximum amount of tan generated by the strongest suction force acts on the air holes of the upstream disk, the airflow resistance also increases. When two upstream vents are provided in the vicinity of the center of the disk, the amount of tan is slightly reduced as compared with the single vent described above, but the ventilation resistance is not felt.
In a laminated disk of this type, since the distance between the disk ventilation holes on both sides as viewed on a plane is short, a small amount of tar is sucked out of the disk from the ventilation holes of the downstream disk. If the amount of the generated tarnish is large, a part of the tar may be deposited on the end face of the fiber rod directly connected to the downstream disk.
This type of laminated disk has directionality. Therefore, when this laminated disc is mounted on the cigarette body in reverse, the suction force of the upstream disc is reduced and the condensation effect is reduced, except in the case where each of the discs has two ventilation holes, so care must be taken. .
[0010]
Next, the characteristics and specifications of a single-sided concave disk which is bonded to both sides of the ring to form a laminated disk will be described in detail.
(B) Material of disk
Since the disc has to form a deep recess in comparison with the thickness of the disc, a material having high compressibility is required. Also, it is desirable that the surface on which smoke passing through the hole collides is non-breathable. This is because if the compressive force applied to the smoke is weak, the condensation effect is reduced, and the generation of tar is reduced.
As the material of the disk, paper is most suitable in consideration of the environmental load and the price at the time of disposal in addition to these conditions. The paper is made from vegetable fibers and preferably has a compressibility of 50-65%.
[0011]
(B) Thickness of disk
The thickness of the disc is determined from the depth of the recess formed on one side of the disc. When the compression ratio of the paper is set to 50 to 65%, the thickness of the disc is set to 0.8 to 1.2 mm so that the depth of the recess of the disc is set to 0.4 to 0.7 mm. When using materials currently on the market, paperboard is suitable.
[0012]
(C) The size of the recess formed in the disk
In this laminated disk, it is necessary to separate the hole positions on the plane of both disks so that the tar accumulated on the downstream disk does not flow into the ventilation holes. In particular, in tobacco with a large amount of tar, if there is a ventilation hole near the tarnish generated on the downstream disk, the tar is sucked out from the hole, and the tarnish is widely deposited on the end surface of the succeeding fiber rod to allow ventilation. May cause decline. Therefore, it is desirable to make the width of the recess as large as possible.
The planar shape of the recess formed in the disk is best a circle considering the ease of processing. The diameter of the dent needs to be determined in consideration of the depth of the dent, but at least the thickness of the material to be used is required from the outer edge of the disk to the edge of the dent. Therefore, the concave diameter of this disk is 4.5 to 5.5 mm.
[0013]
(2) Depth of dent
When the laminated disc is sandwiched between fiber rods, if the end face of the laminated disc is flat, tan occurs around the ventilation holes on the outside of the disc, resulting in reduced ventilation. This phenomenon occurs at both ends of the laminated disk, but especially at the downstream disk, if the amount of tan generated inside the disk is large, it is sucked out from a nearby vent and the end face of the subsequent fiber rod Accumulates on the surface, causing reduced ventilation. As a preventive measure, a depression is formed on the surface of the disk that contacts the fiber rod. If this recess is made as wide as possible, the gap between the fiber rod and the disc should be at least 0.4 mm. Even if the tar sucked out from the vent hole of the downstream disk accumulates on the succeeding fiber rod, if the dent of the disk is wide, the cigarette smoke will bypass that part and where no tar accumulates. Get out of. Further, if the depth of the recess is made deeper than necessary, the thickness of the disk must also be increased, which increases the cost. Therefore, the recess depth of the disc may be 0.4 to 0.7 mm.
[0014]
(E) Ventilation hole diameter
The diameter of the hole provided on the concave bottom surface of the disc is 0.5 to 0.7 mm. Depending on the distance between the two disks (ie, the thickness of the ring), the smaller the hole diameter, the greater the smoke condensation effect. However, on the other hand, the ventilation resistance also becomes large. A hole smaller than 0.5 mm in diameter increases ventilation resistance, so that some people may not be satisfied with smoking. It is also difficult to process holes. On the other hand, in a hole having a diameter exceeding 0.7 mm, the condensation effect is significantly reduced. Therefore, a suitable hole diameter for condensing smoke is 0.5 to 0.7 mm.
[0015]
(F) Number of ventilation holes
If the number of ventilation holes provided in the upstream disk is large, the amount of smoke passing through the holes is dispersed, the force colliding with the downstream disk is weakened, and the condensation effect is reduced. Also, if the ventilation holes of both disks are overlapped on a plane or the distances are too short, the tan generated on the downstream disk flows into the ventilation holes of the disks, causing a decrease in ventilation. Therefore, it is appropriate that the number of air holes provided in the disk is 1-2 for the upstream disk and 2-4 for the downstream disk.
Although there is an individual difference in the suction force of the cigarette, if the number of holes provided in the upstream disk is three or more, the suction force acting on each hole is weakened, and the condensation effect of the entire laminated disk is reduced. Also, if one hole is provided around the hole of the upstream disk and two or more holes are provided in the downstream disk, a large suction force acts on the first disk to obtain the maximum condensation effect. The ventilation resistance increases. In the case where the upstream disk has two holes, the condensation effect is slightly reduced as compared with the single disk and the generated tan is reduced, but the airflow resistance is negligible. Therefore, it can be said that the number of holes provided in the upstream disk is two. If the number of holes in the downstream disk is not equal to or greater than that of the upstream disk, the suction force acting on the upstream disk is reduced. Therefore, the number of holes in the downstream disk is set to 2 to 4, and the hole arrangement and the hole diameter are changed to increase the ventilation resistance caused by the generated dust flowing into the holes and the suction acting on the holes in the upstream disk. Prevent a drop in power.
[0016]
(G) Disk outer diameter
The outer diameter of the disc should be approximately the same as the tobacco rod. Normally, cigarettes made in Japan are classified into normal rolls and fine rolls, and the circumference of each roll is about 25 to 26 mm for normal rolls and 22.5 to 24 mm for fine rolls. (According to the above literature)
Therefore, the outer diameter of the disk is set to 7.0 to 8.1 mm in consideration of the thickness of the outer wrapping paper.
[0017]
Next, the characteristics and specifications of the ring constituting the laminated disk will be described.
(A) Ring material
Paperboard is suitable for making rings using materials currently on the market.
However, since it is difficult to obtain one paperboard having a thickness exceeding 1.0 mm, it is preferable to use two sheets of a material having a thickness of 0.6 to 1.0 mm bonded together.
[0018]
(B) Ring thickness
In the laminated disk of the present invention, the distance between the upstream disk and the downstream disk plays an important role in condensing tobacco smoke together with the ventilation hole. The distance between the two disks is the thickness of the ring itself, and it is desirable to determine an optimum value for the thickness depending on the diameter and number of the ventilation holes and the amount of generation of tar. 0 to 2.0 mm is appropriate. When the diameter of the vent hole of the upstream disk is 0.5 to 0.7 mm and the number of holes is 1 or 2, if this distance exceeds 2.0 mm, the force of the smoke collision is weakened and the condensation effect is reduced. When the distance is 1.0 mm or less, in the case of cigarettes having a large tar content, the tar accumulated on the downstream disk may reach the upstream disk and obstruct the flow of ventilation. Therefore, the thickness of the ring is set to 1.0 to 2.0 mm.
[0019]
(B) Inner diameter of ring
The inner diameter of the ring should be equal to or larger than the concave diameter of the disk bonded to both sides, and should not be smaller than the concave diameter so as not to obstruct the flow of smoke going straight. Therefore, the inner diameter of the ring is set to 4.5 to 5.5 mm.
[0020]
(C) Outer diameter of ring
The outer diameter of the ring is the same as the outer diameter of the discs on both sides constituting the laminated disc, and the numerical value is 7.0 to 8.1 mm, which is the same as the disc.
[0021]
Next, the manufacture of the filter disk will be described.
Press working is the most efficient way to make this disc. A single disk can be basically manufactured in three steps: coining (dent forming), piercing (drilling), and blanking (outer shape). However, if processing is performed using a mold for each step, the cost becomes extremely high. . Therefore, the three steps are integrated into one set of dies, and a multi-piece progressive feed die is used. Similarly, the ring is a multi-cavity progressive feed type. If the layout of material picking is set by taking these molds into consideration for lamination of the disks, the cost of the laminated disks can be kept low.
[0022]
The following problems occur in a cigarette in which only a laminated disc is mounted as a filter. First, there is the danger that the ventilation holes in the upstream disk may be blocked by small pieces of tobacco. Next, the tar is sucked out of the hole of the downstream disk and enters the mouth. Therefore, when a disc filter is used in a cigarette, it must be used in combination with a fiber filter. The disc filter is sandwiched between two or three fiber rods, and the outside thereof is rolled and integrated with a breathable paper. The number of fiber rods connected to the upstream side of the laminated disk is one and may be 5 mm or less. The use of this fiber rod prevents the vents of the disc from being blocked by finely chopped tobacco leaves. The same purpose can be achieved by attaching a disk made of air-permeable paper or cloth to the outer edge of the recess of the upstream disk instead of the fiber rod.
The number of fiber rods connected to the downstream side of the disk is one or two. By increasing the amount of tar removed by the laminated disk, the amount of tar passing through the fiber layer is reduced. As a result, even if the density of the fiber rods is increased, clogging due to tar at the early stage of smoking can be avoided. In this filter, most of the tar content contained in the tobacco smoke in the laminated disc is removed, and the remaining tar content can be absorbed by the fiber rod to increase the filtration efficiency of the entire filter.
[0023]
A short fiber rod is connected to the upstream side of the laminated disk for the purpose described in the preceding paragraph, and two fiber rods connected to the downstream side of the disk are used as two fiber rods, which are directly connected to the laminated disk. Mixes granular activated carbon and makes subsequent fiber rods denser. These are rolled and integrated with paper to form one filter. A cigarette with this filter connected to a tobacco rod removes tar and nicotine from the particle phase, which accounts for about 8% of the tobacco smoke, by means of a laminated disc, and converts about 92% of the gas phase into activated carbon, which turns off odor-causing substances such as acetaldehyde. Adsorb.
The tar itself has a strong odor. Removing the tarnish with the laminated disks means removing the malodorous substances contained in the cigarette smoke. Smoke from which the odor-causing substances have been removed by the laminated disc and activated carbon has a smaller odor than conventional cigarettes.
[0024]
When viewed on a plane, in a filter in which the ventilation holes of both disks are close to each other, when the amount of deposited tan increases, a part of the dust flows into the holes of the downstream disk, and the ventilation resistance increases. In order to improve this point, one or two rows of fine holes are provided in the outer peripheral portion of the wrapping paper connecting the cigarette body and the filter, and outside air is introduced into the fiber rod from the holes to reduce the airflow resistance. . It also has the effect of reducing smoke containing harmful substances.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, two discs 1 of the same specification having a recess 4 on one side and two vent holes 3 provided at the bottom of the recess are bonded to both sides of a ring 2 with the recess facing outward. 1 shows a laminated disc comprising: The ventilation holes 3 of the disk are provided symmetrically around the center of the disk and near the recessed wall of the disk to keep the two ventilation holes as far as possible. Furthermore, smoke passing through the hole in the upstream disk collides with the downstream disk and generates a dust.However, the smoke is prevented from flowing into the ventilation hole of the downstream disk and causing a decrease in ventilation. There must be. Therefore, in order to increase the distance on the plane of the ventilation holes in the upstream and downstream disks, the holes are bonded by shifting the hole phases of both disks by 90 °.
[0026]
In this paper disc, the diameter of the recess is 4.5 to 5.5 mm, the depth of the recess is 0.5 to 0.7 mm, and the diameter of the ventilation hole is selected from 0.5 to 0.7 mm. The outer diameter of the disc should be the same as the tobacco rod. The plate thickness is determined from the range of 0.8 to 1.2 mm according to the depth of the recess.
[0027]
Next, in the paper ring 2 constituting the laminated disk, the inner diameter of the ring is determined from the range of 4.5 to 5.5 mm, and is equal to or larger than the concave diameter of the disk. The outer diameter of the ring should be the same as that of the disk bonded on both sides. The thickness of the ring is determined from the range of 1.0 to 2.0 mm depending on the tar content of the cigarette and the number of air holes in the upstream disk.
[0028]
FIG. 2 shows a laminated disk formed by bonding one disk 1a having one ventilation hole 3a on the upstream side of the ring 2a and four disks 1b having four ventilation holes 3b on the downstream side. In this laminated disc, a strong suction force is applied to the air holes of the upstream disc to increase the condensation effect.
[0029]
FIG. 3 shows a filter in which the laminated disk shown in FIG. 1 is sandwiched between two fiber rods, and the outside is wound around with air-permeable paper 6 to be integrated. The fiber rod 5 on the upstream side is for preventing the air hole from being blocked by finely chopped tobacco pieces, and the length may be 5 mm or less. The fiber rod 5a on the downstream side adds another stage of filtration to the smoke passed through the laminated disk, and the fiber rod is formed by the dust generated inside the laminated disk from the vent hole of the downstream disk. When sucked out, it also has the function of adsorbing this tar. The length of this fiber rod is 10 to 15 mm.
[0030]
FIG. 4 shows the filter shown in FIG. 3 having two fiber rods on the downstream side, and mixing granular activated carbon 7 into the fiber rod 5b directly connected to the laminated disk, which is mainly contained in tobacco smoke. Adsorb substances causing odor. The length of this fiber rod is about 10 mm.
[0031]
FIG. 5 shows a cigarette in which the filter shown in FIG. In this cigarette, outside air is introduced through holes 10 arranged in a line on the outer wrapper 9 connecting the cigarette and the filter. In the laminated disk of the present invention, if the ventilation holes provided on the disks on both sides are close to each other on a plane, when smoking progresses, ts accumulate in the vicinity of the ventilation holes on the downstream disk, which may cause a decrease in ventilation. is there. This problem can be addressed by introducing outside air through holes in the cigarette paper.
[0032]
Embodiment 1
The filter portion of the cigarette was cut off, a filter having the structure shown in FIG. 4 was connected, and the state of generation of tar after smoking was observed.
The disks on both sides of the laminated disk have an outer diameter of 7.7 mm, a plate thickness of 1.2 mm, a depression of 5.2 mm in diameter, and a depth of 0.5 mm. On the other hand, the ring had an outer shape of 7.7 mm, an inner diameter of 5.2 mm, and a plate thickness of 1.8 mm.
First, a laminated disk described in claim 2 was used as a filter. As shown in FIG. 1, two vent holes were provided, and the hole phases of both disks were shifted by 90 °. The diameter of the vent was 0.5 mm, and the pitch of the holes was 4 mm across the center.
The cigarette used in the experiment was a domestic product, and the contents of tar and nicotine were described as 10 mg and 0.8 mg, respectively.
After smoking this cigarette up to half of the tobacco rod, the state of the tarnish in the laminated disc used as a filter was observed. As a result, two donuts deposited in the shape of a donut were found inside the downstream disk. The resin had an inner diameter of 1 to 1.5 mm, an outer diameter of 2.5 to 3 mm, and a height of about 0.5 mm. In addition, there was no outflow of tar from the vent holes outside the downstream disk. The number of smoking clothes up to half of the tobacco rod was eight, and the ventilation resistance was negligible.
[0033]
Embodiment 2
Next, the state of the tar was confirmed on the laminated disk described in claim 3. The filter of the structure shown in FIG. 4 was connected to the tobacco rod by changing the specification of the laminated disk used in the first embodiment only to the ventilation hole of the upstream disk and making one hole of 0.5 mm in diameter at the center of the disk. did. The same cigarette as in Example 1 was used, and half of the tobacco rod was smoked. As a result, one donut-shaped tar was deposited at the center of the downstream disk. The resin had an inner diameter of 1.5 to 2 mm, an outer diameter of 3 to 4 mm, and a height of about 1 mm. Further, two tars flowing out of the vent holes were observed outside the downstream disk. The tar had an outer shape of about 1 mm and a height of 0.5 to 1 mm. This filter felt that the ventilation resistance was large.
Thus, the experiment was again performed with the diameter of the vent hole of the upstream disk changed to 0.6 mm.
As a result, the ventilation resistance was reduced to a negligible level. The dirt deposited in the laminated disk had an inner diameter of 2 to 3 mm, an outer diameter of 4 to 5 mm, a height of 0.5 to 1 mm, and had a donut shape divided at a vent.
Outflow of the tar from the ventilation hole was observed outside the downstream disk, and the tar had an outer diameter of about 1.5 mm and a height of about 0.5 mm.
The number of smoking clothes up to a half of the tobacco rod was 10 in each case.
[0034]
【The invention's effect】
The filter of the present invention in which the laminated disk is sandwiched between fiber rods has the following effects when attached to a tobacco rod.
[0035]
The tobacco smoke is condensed in the lamination disc for each dose, and after separating a substantially constant amount of tar, the fiber rod at the end of the filter is filtered through adsorption to enter the mouth. As a result, the taste of the cigarette fitted with this filter can be reduced in the spiciness due to tar, light and mellow, and a substantially uniform taste can be obtained until the end of smoking without impairing the taste.
[0036]
The main components of tar are tar and nicotine, which are thought to cause respiratory diseases and heart disease. Therefore, removal of the tar by the laminated disk is effective in preventing health damage to smokers.
[0037]
Furthermore, the removal of the tar by the laminated disk has the effect of reducing indoor pollution and irritating odor due to smoke exhaled by the smoker.
[0038]
The amount of tar and nicotine removed per cigarette can be quantitatively controlled by the diameter and number of vent holes provided in the disk and the thickness of the ring. Can be provided.
[0039]
The elements constituting the laminated disk have a simple shape and can be mass-produced using inexpensive materials. Therefore, the cost of the laminated disk can be kept low, so that the cost of cigarettes using this filter does not increase significantly.
[Brief description of the drawings]
FIG. 1A is a plan view of a laminated disk in which disks of the same specification are adhered to both sides of a ring, as viewed from an upstream side. (B) is an AA cross-sectional view thereof.
FIG. 2A is a plan view of a laminated disk in which two disks having different ventilation holes are adhered to both sides of a ring, as viewed from the upstream side. (B) is a cross-sectional view taken along the line BB.
FIG. 3 is a sectional view of a filter in which a laminated disk is sandwiched between two fiber rods.
FIG. 4 is a cross-sectional view of a filter in which two fiber rods are connected to the downstream side of a laminated disk and granular activated carbon is mixed in the fiber rod directly connected to the laminated disk.
FIG. 5 is a cross-sectional view of a cigarette in which a filter having a laminated disc sandwiched between two fiber rods is connected to a tobacco rod, and the paper is provided with an outside air introduction hole.
[Explanation of symbols]
1, 1a, 1b Disc alone
2, 2a ring
3, 3a, 3b vent
4 dent
5, 5a, 5b Fiber rod
6. Breathable wrapping paper
7 granular activated carbon
8 Tobacco rod
9 roll paper
10 outside air inlet

Claims (8)

A laminated disc formed by bonding two discs having vent holes at the bottom of a recess formed on one side and bonding the discs to both sides of a ring (a disc with a hole at the center) with each recess facing outward. And, the tobacco smoke passing through the hole of the upstream disk goes straight through the hole of the ring and collides with the inside of the downstream disk, and the generated tan is stored inside the laminated disk. Cigarette filter. A laminated disc comprising two discs and a ring of the same specification, wherein two ventilation holes provided in the disc recess are symmetrical about the disc center and are near the recess wall of the disc, 2. The cigarette filter according to claim 1, wherein by changing the hole phase of both disks by about 90 [deg.], Tar that occurs on the downstream disk is prevented from accumulating near the ventilation holes of the disks. Vent holes provided in the recesses of both discs are laminated discs having different diameters, numbers and arrangements, and one vent hole in the upstream disc is provided at the center of the disc or two at the center of the disc. By providing two to four vent holes in the downstream disk near the recessed wall, the suction force acting on the upstream disk is increased to improve the condensation effect, and the ventilation holes in the downstream disk are located in close proximity. 2. The cigarette filter according to claim 1, wherein the tar does not accumulate at the position. The cigarette filter according to any one of claims 1 to 3, wherein the single-sided concave disc is manufactured according to the following specifications and processes.
(A) First step of forming a columnar recess having a diameter of 4.5 to 5.5 mm and a depth of 0.4 to 0.7 mm on the upper surface of a paper sheet having a thickness of 0.8 to 1.2 mm. (B) a second step of forming one to four vent holes having a diameter of 0.5 to 0.7 mm in the bottom surface of the dent; Process 4. The cigarette filter according to claim 1, wherein the ring is manufactured according to the following specifications and steps.
(A) First step of making a hole of 4.5 to 5.5 mm in a paper sheet having a thickness of 1.0 to 2.0 mm (B) Sheet outside the hole with a punch having substantially the same diameter as a tobacco rod Second step of punching The laminated disc according to any one of claims 1 to 3 is interposed between the fiber rods, and the filter integrated by winding the outside with a breathable paper is connected to the tobacco rod, and the upstream side of the disc is connected to the filter. A cigarette in which a fiber rod prevents the disc hole from being blocked by tobacco pieces, and a downstream fiber rod adsorbs tar and the like in tobacco smoke that could not be removed by condensation in the disk. The number of fiber rods connected to the downstream side of the laminated disk is two, and particulate activated carbon is mixed in the fiber rods directly connected to the disk, and harmful substances in tobacco smoke that could not be removed by condensation in the disk 7. The cigarette according to claim 6, wherein the cigarette is adsorbed. The cigarette according to any one of claims 6 to 7, wherein the outer wrapping paper connecting the tobacco rod and the filter is provided with small holes in one or two rows on the circumference and connected to the downstream side of the laminated disc. A cigarette in which outside air is introduced into the fiber rods to reduce the airflow resistance acting on the holes in the upstream disk and the reduction in airflow due to tar accumulated in the disk.

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